National Weather Service Weather Forecast Office

A collection of Non-Precipitation Weather Products for the Great Lakes Region issued during the past 24 hours.

Any weather event that does not contain precipitation is handled by a
Non-Precipitation Weather Product (NPW). An NPW is used to:

issue the initial warning or advisory
change the type of warning or advisory
change the expiration time of the event
add or delete affected areas
update the warning, watch, or advisory
terminate the warning, watch, or advisory

Some of the weather events that would prompt the issuance of
a NPW are...